Portable cutter for keyways



9, 1961 w. H. JOHNSON ET AL 2,997,925

PORTABLE CUTTER FOR KEYWAYS 5 Sheets-Sheet 1 Filed Sept. 28, 1959grwvwhow ATTOR N EYa Aug 29, 1961 w. H. JOHNSON ET AL 2,997,925

PORTABLE CUTTER FOR KEYWAYS Filed Sept. 28, 1959 3 Sheets-Sheet 2 Q ii?a lf l K E ATTOR N EYS 1961 w. H. JOHNSON ETAL 2,997,925

PORTABLE CUTTER FOR KEYWAYS 3 Sheets-Sheet 5 Filed Sept. 28, 1959 I MK 55 M ATTORNEYS The present invention relates to portable cutters forkeyways of the type used in shafts.

The primary object of the invention is to provide a portable keywaycutter for shafts which can be utilized without removing the shaft fromits support.

Another object of the invention is to provide a portable keyway cutterof the class described above with which both longitudinally extendingkeyways and Woodruff keyways can be cut without the necessity of makingmechanical changes in the apparatus.

A further object of the invention is to provide a portable keyway cutterof the class described above which is fully adjustable to permit its useover a wide range of key sizes.

A still further object of the invention is to provide a keyway cutter ofthe class described above provided with interchangeable means to permitkeyways to be cut in a plurality of shafts of different diameters.

Another object of the invention is to provide a portable keyway cutterof the class described above which is inexpensive to manufacture, simpleto use and which reduces the labor required for cutting keyways inshafts to a Other objects and advantages will become apparent in thefollowing specification when considered in light of the attacheddrawings, in which:

FIGURE 1 is a perspective view of the invention;

FIGURE 2. is a fragmentary vertical sectional view taken along the line2--2 of FIGURE 1, looking in the direction of the arrows;

FIGURE 3 is a transverse sectional view taken along the line 3-3 ofFIGURE 1, looking in the direction of the arrows;

FIGURE 4 is a fragmentary bottom plan view of the invention;

FIGURE 5 is a fragmentary front elevation of the invention; and

FIGURE 6 is a perspective view of one of the interchangeable bushingsshown removed from the keyway cutter.

Referring now to the drawings in detail wherein like referencecharacters indicate like parts throughout the several figures, thereference numeral 10 indicates generally a portable keyway cutterconstructed in accordance with the invention.

The portable keyway cutter 10 includes an elongated body 11 having asemi-cylindrical enlarged head 12 integrally formed on one end thereof.The head 12 is downwardly offset from the body 11, as can be clearlyseen in FIGURE 2.

The upper surface of the body 11 is relatively straight and is providedwith an elongated dove-tail tongue 13.

The body 11 at the end thereof opposite the head 12 is provided with anupstanding boss 14 arranged in oppositely extending relation withrespect to' the head 12. A transverse cylindrical bore 15 extendsthrough the head 12 and has one side thereof intersecting the peripheralsurface of the head 12 delineating a pair of spaced parallel edges 16,17, as can be clearly seen in FIGURES 1 and 5. The head 12 has agenerally rectangular keyway 18 formed therein within the bore 15 inopposed relation to the edges 16, 17, as is illustrated in FIGURE 2.

A worm-drive member 19 is journalled in the head 12 fates Patent 0 "icewith its axis parallel to the axis of the bore 15 with the drive member19 extending into the bore 15. A shaft 20 is rigidly secured to one endof the drive member 19 and extends therefrom through the head 12 andoutwardly therebeyond. A knob 21 is mounted on the outer end of theshaft 20 to permit the shaft 20 and the drive member 19 to be rotatedthereby.

An adapter bushing, generally indicated at 22, has a generallycylindrical external face 23 and a cylindrical internal bore 24 arrangedeccentrically to the external face 23 with their axes parallel. Theinternal bore 24 intersects the external face 23 to form a pair ofspaced apart parallel edges 25, 26.

The adapter bushing 22 has a concave threaded groove 27 formed in thegenerally cylindrical external surface 23 generally oppositely of theedges 25, 26. A generally rectangular keyway 28 is also formed in theadapter bushing 22 through the cylindrical outer surface 23 adjacent andparallel to the threaded groove 27. A pair of threaded set screw bores29 extend transversely through the adapter bushing 22 intersecting thegenerally cylindrical bore 24. A set screw 30 is threaded into each ofthe bores 29, for reasons to be assigned.

The adapter bushing 22 is mounted for longitudinal sliding movement inthe 'bore 15 of the head 12 and a rectangular key 31 extends into boththe keyway 18 in the head 12 and the keyway 28 in the bushing 22,preventing relative rotation between the bushing 22 and the head 12. Thedrive member 19 in thehead 12 extends into the threaded groove 27 in theadapter bushing 22 so that rotation of the drive member 19 will slidethe adaptor bushing 22 longitudinally of the bore 15.

A carriage 32 is provided with an elongated dove-tail slot 33 arrangedin longitudinal sliding engagement over .the dove-tail tongue 13 on thebody 11. The carriage 32 has a threaded bore 34 arranged centrallytherein and extending parallel to the dove-tail groove 33. A threadedshaft 35 is threaded into the threaded bore 34 and is journalled forrotation in the upstanding boss 14. A hand crank 36 is secured to theoutboard end of the threaded shaft 35 so that the shaft 35 may berotated by hand. Rotation of the shaft 35 causes relative slidingmovement between the carriage 32 and the body 11.

The carriage 32 at the end thereof opposite the boss 14 is provided witha pair of blocks 37, 38 arranged in spaced apart parallel relation andintegrally formed with the carriage 32. The 'block 38 is oifset towardthe cylindrical head 12 beyond the confines of the body 11. A shaft 39is journalled in the block 37 with one end 40 thereof terminating inengagement with the adjacent face of the block 38. A gear 41 is fixed tothe opposite end of the shaft 39 adjacent the opposite side of the block37. A cutter shaft 42 is journalled in the block 38 in axial alignmentwith the shaft 39 and has a reduced end portion 43 thereof secured in asocket 44 in the shaft 39 by means of a set screw 45. The shaft 42 has acircular cutter 46 integrally secured to the end thereof opposite thereduced end portion 43 and arranged in aligned re lation intermediatethe edges 25, 26 and the edges 16, 17.

A circular housing 47 is secured to the carriage 32 oppositely of theblock 38 and has a plurality of radially inwardly extending set screws48 threaded thercthrough. An electric motor 49 extends into the housing47 and is clamped therein by the set screws 48. A gear 50 is mounted onthe electric motor 49 and meshes with the gear 41 so that rotation ofthe motor 49 will rotate the cutter 46.

In the use and operation of the invention, a cylindrical shaft 51 is tobe provided with a keyway and the adapter bushing 22 is slipped over theend thereof and clamped thereto with the set screws 30. The head 12 isthen engaged over the adapter bushing 22 and adjusted Hanna! hr.

withrespect thereto with the knob 21; The cutter 46 is then rotated bymeans of the electric motor 49 and the carriage 32 is adjusted with thehand crank 36 to bring the cutter 46 into cutting engagement with theshaft 51.

In cutting a Woodruif key the cutter 46 is moved by means of thecarriage 32 into the shaft while the head112 remains stationary withrespect to the adapter bushing 22'. The cutter 46 is then moved directlyout of the shaft 51, resulting in a semi-circular key receiving grooveof the Woodrufi type.

In forming rectangular keyways in the shaft 51, the cutter 46 is movedinto the shaft 51 to the desired depth by use of the hand crank 36. Thecutter 4.6 is then moved longitudinally of the shaft 51 by rotation ofthe handle knob 21 so as to rotate the drive member 19 with respect tothe adapter bushing 22. The head 12 and the carriage 32 are movedlongitudinally of the shaft 51 to the desired extent or until theirlimit of movement has been ing an internal bore 24 of the desireddiameter is used in the head 12. It should also he understood that thecutter 46 may be interchanged to provide the desired circumference andwidth of cut when forming dilferent keyways.

Having thus ;described the preferred embodiment of the invention,itshould be understood that numerous structural modifications andadaptations may he resorted to without departing from the scope of theappended claim.

What is claimed: 4 A portable keyway cutter comprising an elongated bodyr 4 having a semi-cylindrical enlarged head, said body having anelongated dove-tail tongue thereon and said head having a transversecylindrical bore with a slot in the side thereof, said bore having alongitudinally extending keyway therein, a worm gear journalledtransversely in said head intersecting said bore, an adapter bushingsubstantially crescent-shaped in cross section, and having a keywaytherein aligned with said first-mentioned keyway, seated in said bore, akey in said keyways, said adaptor having a threaded channel inthe outersurface thereof co-acting with said worm for adjustment or said adaptortransversely of said head, said adaptor also having an elongated slotaligned with said side slot, elongated carriage having a dovetail grooven ounted on said dove. tail tongue for longitudinal movement relativetotsaid body, said carriage having a threaded bore one end thereof, atongue on the end of said body. having a bore therein aligned with saidthreaded bore, a screw extended through said bore in said tongue'andengaging in said threaded bore for longitudinal movement of saidcarriage relative to said body, said carriage having a slot in its otherend and a perpendicular bore intersect ing said slot, a shaft rotatablymounted in said perpendicular bore, motor means mounted on said carriagefor driving said shaft, and a cutter removably mounted on said shaft inline with said slots in said here and said adaptor.

References (Jited in the file of this patent UNITED STATES JPATENTS

